Looks like it uses a couple of cameras/sensors that you pop on the top corners of the screen. Not too fussed about the gaming potential, but the digital painting option looks really promising, a bit like sitting/standing at an easel. I guess it's practical success may come down to accuracy and 'feel' though.

I got a cheapo graphics tablet from Lidl the other day for (I think) about a third of the price of this. It's way more accurate than my screen is and has more than enough degrees of sensitivity for me. Granted, with that you're not putting the stylus where you're painting, but it does mean you can put a picture under the built-in mat and trace round a drawing, while seeing what you're doing at the same time. It's also got loads of configurable buttons and two spinners, to be used as scrollers. Or I could configure them as inputs to MAME and get Tempest running! Now that's what I call a gaming input!